Cooler for sheet-glass apparatus



Jah. 10, 1928.

J. L. DRAKE COOLER FOR SHEET GLASS APPARATUS Filed March 2. 1927 t den. 10, 1928..

PATENT OFFEGE.

ltiHINl IL. DRAKE, 011" TOLEDO, OHIO, ASSIGNO'B TO THE LIBBEY-OWENS SHEET GLASFl COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIQ.

COOLER FUR SHEET-GLASS APPARATUS.

Application filed March A, 1927. Serial lton t?l,959.

'lhis invention relates to improvementsin sheet glass apparatus, and has more partic nlar reference to a novel term of cooler for association therewith, 0

in certain processes for drawmg sheet elass such as that disclosed in the patent to ljolhurn halttlfilflll, granted December 4, 19th a pan ot coolers are arranged at opposite sides or the sheet and relatively close to the lit surtace oi the molten glass from which the till dil

sheet is drawn to absorb suficient heat to permit the drawing of a good sheet of glass.

Certain types ot' these coolers are so con structed that drops ct moisture will condense upon the outer surface ot the walls thereoif' and this condensation causes the coolers to rust. llot only do the drops 0t moisture trorn condensation fall down into the molten glass :t'roni which the sheet is being drawn hut also the rust termed as a result at this condensation frequently falls down into the said glass, and subsequently finding its way into the sheet produces detests therein. Again, in other coolers, the

condensation oi moisture terms or him upon the outer surt'ace ot the walls thereof so that it becomes necessary that these coolers be frequently cleaned in order to remove this film. .hlso when these coolers are originally placed in the maclune vor aiter they have been cleaned to remove the above mentioned iihn or rust therefrom, the surt'aces tl'iereol are bright and shiny. l re u uently, unhurnt gases escaping trorn the it :lnrnace and heating chamber ignite to term a dance as they reach the atmosphere, and it has been tound that this flame plays upon or lichs the coolers and. especially the bottoms thereot causing hlue spots thereon lines much as hlue or any other darlr color will absorb more heat than'will" a bright shiny surface, it will be apparent that un-unilorin heat absorption from the molten glass pass ing under the cooler will naturally result,

jdtfi important ohject oil the invention 18 to provide an improved cooler so constructed that drops oi moisture will be prevented :lrorn lorrning upon the outer snrtace oil the walls thereoih Another object oi the invention is to provide such an improved cooler oi this nature which will permit ot a greater and more uniiorni heat ahsorption.

ll -hirther olo lect the invention is to provide such an improved cooler of this nature including means for absorbing any moisture which might condense thereon.

A still turther object of the invention is to provide such an improved cooler of this nature including means for protecting the same to prevent discoloring thereot from flames playing thereon.

Uther objects and advantages oi the invention will become more apparent during the course of the following description when taken in connection with the accompanying drawings In the drawings wherein lilre numerals are employed to designate lilre parts throughout the some,

lFig. 1- is a longitudinal vertical section through a portion ot sheet glass drawing apparatus showing associated therewith, in cross section, a pair of coolers constructed in accordance with the present invention,

Fig. 2 is a. perspective sectional view ol one at the improved coolers, and

Fig. 3 is a sectional view oil a slightly modified type of cooler,

Referring now more in detail to the no companying drawings, the numeral 10 generally designates a receptacle or draw pot supported above a heating chamberll and containing a supply of molten glass'l2 which is continuously supplied thereto from a suitable furnace 13. A sheet of glass idis drawn lrornthe molten glass 12 in the re ceptaele by means of the drawing mechanism l5.

'lo maintain the sheet to width, lnnurled rollers 16, or similar means, are arranged at opposite sides of the sheet at both ed es thereof; and are driven at a speed to enahle a relatively heavy knurled edge to he termed on said sheet which is capable oi holding the same to width Arranged above the receptacle 10 are cover or lip tiles l'l' which tend to lorce any heat currents escaping itrorn the heating chamber 11 or turnace 13 downwardly onto the surface of the molten glass 12.

Positioned at each side of the sheet i l and immediately adjacent the surtace oil the molten glass l2 are the improved coolers Ltd which serve to protect the sheet lroin heated air escaiin irons the turnace and heatine :1 1:9

chamber and at the same time aid in ahsorhing su'lhcient heat trons the molten glass till ill

rot

passing thereunder to give it the proper viscosity to permit it to be drawn away in sheet form.

The improved coolers are identical in construction so that a detail description of only one of them is thought to be necessary. Each cooler comprises a hollow elongated casing 19 preferably constructed from a suitable metal, and which casing may be substantially rectangular in cross section, as shown, or Which may be of any other form desired. The cooler is adapted to be internally cooled by circulating a suitable cooling medium such as Water therethrough. This cooling medium is adapted to enter through the pipe 20 extending longitudinally within the casing 19 and pass from the said pipe through a plurality of openings 21 therein into the said casing. As it becomes heated, the cooling medium passes upwardly and exteriorly of the cooler through the pipe thereupon. To overcome these disadvantages, the Walls ofthe metallic casing 19 are covered with a covering 23 preferably of asbestos, although it may be of any other suitable fibrous material.

This covering 23 consists preferably of one 'or more thicknesses of asbestos paper of the kind ordinarily used in the covering of furnace pipes, but it is not to be of such a thickness that it will act as an insulator. It has been found by experiments that an ordinary furnace pipe covered with one or two thicknesses of this asbestos paper will lose more heat than will a smooth shiny pipe.

This asbestos covering 28 is adapted to accomplish three distinct purposes. In the I first place, dueto its porous nature, it will serve to absorb any moisture which might condense upon the outer surface of the walls of the casing 19 and thus prevent drops of moisture'from forming thereon. Secondly, due to the porous nature of the covering, a

greater heat absorption will occur, and

thirdly, since the bottom of the cooler is also covered, it will notbe subjected to discoloring from flames playing thereupon, and this will result in a more uniform as Well as a greaiter heat absorption from the molten glass passing thereunder.

In the form of the invention shown Fig. 3, the asbestos covering 23 covers only the top of the casing 19 and a greater porwalls thereof but does not It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape. size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoincd claims.

Claims:

1. In sheet glass apparatus, a cooling member, and means for preventing moisture from forming in drops thereon.

2. In sheet glass apparatus, a cooling member, and means for absorbing moisture which condenses thereon.

3. In sheet glass apparatus, a cooling member, and means for protecting the same to prevent discoloring thereof when sul jected to the direct action of flames.

In sheet glass apparatus, a cooling member, and a covering therefor for preventing moisture from forming in drops thereon.

5. In sheet glass apparatus, a cooling member, and a covering therefor for absorbing moisture which condenses thereon.

6. In sheet glass apparatus. a cooling member, and a covering therefor to protect the same to prevent discoloring thereof when subjected to the direct action of flames.

7. In sheet glass apparatus, a cooling member, and a fibrous coverin therefor.

8. In sheet glass apparatus, a cooling member, and an asbestos covering therefor.

9. A cooler adapted for use in sheet glass apparatus, comprising a hollow metallic cusing, and a fibrous covering for said casing.

10. A cooler adapted for use in sheet glass apparatus, comprising a hollow metallic cusing, and an asbestos covering for said casing.

11. A cooler adapted for use in sheet glass apparatus, comprising a hollow metallic cos-- ing, an asbestos covering fo said casing. and means for circulating a cooling medium through said casing.

12. The combination with a receptacle containing a mass of molten glass, and means for drawing a sheet therefrom, of coolers arranged at opposite sides of said sheet closely adjacent the surface of the molten glass, each comprising a hollow metallic: casing, and covering for said casing.

13. The combination with a receptacle contaminga mass of molten glass. and means for drawing a sheet therefrom, o1 coolers arranged at opposite sides of said sheet closely adjacent the surface of the molten gloss, each comprising a hollow metallic casing. and :1 fibrous covering for said casing.

14. The combination with areccptacic con taining a mass of molten glass, and mcamt for drawing a sheet therefrom. of: coolers :1- ranged t opposite sidcs oi s i are surra c 0.111161? comprising hollow? metal asbestos covering for said casing, and means adjacent the surface of the molten glass, each for circulating a cooling medium through comprising a hollow metallic casing, and an said casing. asbestos covering for said casing. 1 15. The combination with areceptacle con- Si ned at Toledo, in the county of Lucas 55 taining a mass of molten glass, and means and state of Ohio, this 26th day of Februfor drawing a sheet therefrom, of coolers arary 1927. ranged at opposite sides of said sheet closely JOHN L. DRAKE. 

